Update 7/27/17:
According to the New York Times, the existing policy on transgender people in the military "remains in place" for now, despite Trump's tweets. "The policy on who is allowed to serve will not change until the White House sends the Defense Department a rules change and the secretary of defense issues new guidelines."
Original article below:
On Wednesday, Donald Trump broke out the words "please" and "thank you" to make a shattering declaration on Twitter about transgender service in the military.